1551988 has 12 divisors (see below), whose sum is σ = 2756992. Its totient is φ = 764280.

The previous prime is 1551967. The next prime is 1551997. The reversal of 1551988 is 8891551.

It is a super-5 number, since 5×1551988⁵ (a number of 32 digits) contains 55555 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2628 + ... + 3163.

2^1551988 is an apocalyptic number.

It is an amenable number.

1551988 is a deficient number, since it is larger than the sum of its proper divisors (1205004).

1551988 is a wasteful number, since it uses less digits than its factorization.

1551988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5862 (or 5860 counting only the distinct ones).

The product of its digits is 14400, while the sum is 37.

The square root of 1551988 is about 1245.7881039727. The cubic root of 1551988 is about 115.7789090405.

It can be divided in two parts, 15 and 51988, that added together give a triangular number (52003 = T₃₂₂).

The spelling of 1551988 in words is "one million, five hundred fifty-one thousand, nine hundred eighty-eight".